A RIGID AND RELIABLE DEVICE TO SUPPORT TUBE BUNDLES WITH LOWER INTER-SPACING IN A BUNDLE CHAMBER OF FLUIDIZED BED COMBUSTIONS BOILERS

The invention relates to a rigid and reliable device to support tube bundles with lower inter-spacing a bundle chamber of fluidized bed combustion boilers, the tube bundle comprising at least one vertical tube (1) having a central hole formed on the vertical tube (1); and at least two multi loop horizontal coil assemblies, the support device configured as a sold forged block (3) having semi-circular profiles at both ends (4) of the block (3), the vertical tube (1) is shrink-fit with the forged block (3) through the central hole to form a sub-assembly (1, 3), the sub-assembly is inserted in between the at least two multi loop horizontal coil assemblies (2) with the coil elements pushed into said semi- circular profiles; wherein the end blocks (4) are welded with the forged block (3) upon insertably locating the coil elements (2) such that the horizontal tube elements (2) remain free from welding to allow a force longitudinal movement of the vertical tube (1) when susceptible to thermal expansion during boiler operation and wherein the vertical tube (1) is a steam-cooled hanger tube.